PHP 实现人民币小写转换成大写的方法及大小写转换函数

<?php 
header("charset=utf-8;"); 
function numtrmb($num){ 
 $d = array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); 
 $e = array('元', '拾', '佰', '仟', '万', '拾万', '佰万', '仟万', '亿', '拾亿', '佰亿', '仟亿'); 
 $p = array('分', '角'); 
 $zheng = "整"; 
 $final = array(); 
 $inwan = 0;//是否有万 
 $inyi = 0;//是否有亿 
 $len = 0;//小数点后的长度 
 $y = 0; 
 $num = round($num, 2);//精确到分 
 if(strlen($num) > 15){ 
 return "金额太大"; 
 die(); 
 } 
 if($c = strpos($num, '.')){//有小数点,$c为小数点前有几位 
 $len=strlen($num)-strpos($num,'.')-1;//小数点后有几位数 
 }else{//无小数点 
 $c = strlen($num); 
 $zheng = '整'; 
 } 
 for($i = 0; $i < $c; $i++){ 
 $bit_num = substr($num, $i, 1); 
 if ($bit_num != 0 || substr($num, $i + 1, 1) != 0) { 
  @$low = $low . $d[$bit_num]; 
 } 
 if ($bit_num || $i == $c - 1) { 
  @$low = $low . $e[$c - $i - 1]; 
 } 
 } 
 if($len!=1){ 
 for ($j = $len; $j >= 1; $j--) { 
  $point_num = substr($num, strlen($num) - $j, 1); 
  @$low = $low . $d[$point_num] . $p[$j - 1]; 
 } 
 }else{ 
 $point_num = substr($num, strlen($num) - $len, 1); 
 $low=$low.$d[$point_num].$p[$len]; 
 } 
 $chinses = str_split($low, 3);//字符串转化为数组 
 for ($x = count($chinses) - 1; $x >= 0; $x--) { 
 if ($inwan == 0 && $chinses[$x] == $e[4]) {//过滤重复的万 
  $final[$y++] = $chinses[$x]; 
  $inwan = 1; 
 } 
 if ($inyi == 0 && $chinses[$x] == $e[8]) {//过滤重复的亿 
  $final[$y++] = $chinses[$x]; 
  $inyi = 1; 
  $inwan = 0; 
 } 
 if ($chinses[$x] != $e[4] && $chinses[$x] !== $e[8]) { 
  $final[$y++] = $chinses[$x]; 
 } 
 } 
 $newstr = (array_reverse($final)); 
 $nstr = join($newstr); 
 if((substr($num, -2, 1) == '0') && (substr($num, -1) <> 0)){ 
 $nstr = substr($nstr, 0, (strlen($nstr) -6)).'零'. substr($nstr, -6, 6); 
 } 
 $nstr=(strpos($nstr,'零角')) ? substr_replace($nstr,"",strpos($nstr,'零角'),6) : $nstr; 
 return $nstr = (substr($nstr,-3,3)=='元') ? $nstr . $zheng : $nstr; 
} 
echo numtrmb(965002.65); 

<?php
 $str = "i want to fly";
 $str = strtolower($str);
 echo $str;
?>

i want to fly